KEPCO BOP 20-10DC Modification Sheet

MODIFICATION OF STANDARD

KEPCO®

KEPCO MODEL BOP 20-10MC
KEPCO MODEL BOP 20-10DC

THE POWER SUPPLIER™

The Kepco Models BOP 20-10MC and BOP 20-10DC have been modified from standard Kepco
Models BOP 20-10M and BOP 20-10D, respectively, to be stable handling capacitive loads up
to 10 mF.

INSTRUCTION MANUAL CORRECTIONS:

This modification makes the BOP more suitable for a wide variety of applications such as
solar cell/ solar panel testing, piezoelectric device driving/ testing, capacitor testing, capacitive
transducer driving/testing and powering industrial or lab-type applications for capacitive or
capacitive-resistive loads.

Static specifications representing the unit’s accuracy in Voltage mode are identical with the
standard BOP models, while the ripple and noise specifications are better (approximately 50%
lower) for MC and DC models than standard BOP models.

Specifications listed in Table 1 are for BOP 20-10MC and BOP 20-10DC in Voltage Mode.

TABLE 1. BOP 20-10MC AND BOP 20-10DC SPECIFICATIONS

Bandwidth (DC to f-3dB)

Resistive Load, Nominal Capacitive Load, 10µF

8.9 kHz 15.6 kHz 42 µS120 µS

NOTES:
(1) Nonuniformities of the frequency response for the standard 10µF load create a larger 3-dB bandwidth than

for the resistive load.
(2) 10% to 90%, with nominal resistive load.
(3) Load between infinity and nominal resistive load values.

(1)

Rise/Fall Time

(2)

Recovery at Step Load

(3)

In voltage mode the bandwidth of the BOP 20-10MC and DC models is less than the stan­dard BOP, while the response time is increased. Nonuniformities of the frequency response can
be nearly eliminated by reducing the bandwidth in Voltage mode. Bandwidth can be reduced in
a predictable manner by increasing the internal compensation capacitance by placing an exter­nal capacitor in parallel across C21 of Assembly A1 (see Table 2 and Figure 1).

TABLE 2. BANDWIDTH CORRECTION

EXTERNAL CAPACITOR

(ACROSS A1C21, SEE FIGURE 1)

1 nF 2.2 nF 4.7 nF 15 nF 33 nF 47 nF 100 nF

CORRECTED BANDWIDTH 8.0 kHz 6.3 kHz 5.2 kHz 2.6 kHz 1.4 kHz 1.1 kHz 0.55 kHz

NOTE: Listed bandwidth correction values are for Voltage mode, nominal resistive load.

BOP 20-10MC/DC/ 031212

KEPCO, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11355 U.S.A. z TEL [phone] z FAX [phone]

email: [e-mail] z World Wide Web: http://www.kepcopower.com

In Current Mode the dynamic specifications are: 3-dB bandwidth of 4.4kHz and rise/ fall time
of 80µs (lower bandwidth and higher rise/fall time than the standard BOP M and D models).

FIGURE 1. ASSEMBLY A1, EXTERNAL BANDWIDTH CORRECTION CAPACITOR LOCATION

2 BOP 20-10MC/031212